Int 21 Fn 30FF - Desq??? - Installation Check [-] AX = 30FFh CX = 4445h ("DE") DX = 5351h ("SQ") Return: BH = 05h if installed ??? Note: called by DUBLDISK.COM v2.6; this function is not supported by DESQview, so it may be for DESQview's precursor DESQ. See Also: AX=4404h"DUBLDISK"